Many years ago, a team of researchers at the department of anthropology at the University of Minnesota decided to put this association to the test. They studied certain fringe religious groups, such as fundamentalist Baptists, Pentecostalists and the snake-handlers of West Virginia, to see if they showed the particular type of psychopathology associated with mental illness. Members of mainstream Protestant churches from a similar social and financial background provided a good control group for comparison. Some of the wilder fundamentalists prayed with what can only be described as great and transcendental ecstasy, but there was no obvious sign of any particular psychopathology among most of the people studied. After further analysis, however, there appeared a tendency to what can only be described as mental instability in one particular group. The study was blinded, so that most of the research team involved with questionnaires did not have access to the final data. When they were asked which group they thought would show the most disturbed psychopathology, the whole team identified the snake-handlers. But when the data were revealed, the reverse was true: there was more mental illness among the conventional Protestant churchgoers - the "extrinsically" religious - than among the fervently committed.